Understanding ASQ-CQA -Knowing The Ways
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Example<br />
Consider a quality characteristic with target of 100.00 μm and upper and lower specification limits of (±4μm)<br />
106.00μm and 94.00μm respectively. If, after carefully monitoring the process for a while, it appears that the<br />
process is in control and producing output predictably (as depicted in the run chart below), we can meaningfully<br />
estimate its mean and standard deviation.<br />
If ũ and σ are<br />
estimated to be<br />
98.94 μm and<br />
1.03 μm,<br />
respectively,<br />
then<br />
Charlie Chong/ Fion Zhang
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